science exam puzzle

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Across
  1. 4. the inside of an atom, made of protons and neutrons
  2. 5. mixture has same composition throughout
  3. 7. mixture of one substance dissolved in another substance
  4. 8. crude oil
  5. 10. atomic change
  6. 11. going from gaseous to liquid state
  7. 13. the _______ theory of matter says that all matter is made of constantly moving particles
  8. 14. how big, how much space
  9. 16. blue gas giant and farthest planet from sun
  10. 18. how tightly packed the matter is
  11. 19. change from liquid to gaseous state due to increasing heat
  12. 21. interstellar dust and gas cloud
  13. 24. going from liquid to gaseous state without having to boil
  14. 25. blue gas giant
  15. 26. how heavy, how much gravity pulls on the object
Down
  1. 1. irreversible change, recombines atoms in molecules
  2. 2. largest planet, "king planet"
  3. 3. energy of moving molecules
  4. 6. mixture does not have same composition throughout
  5. 7. removing impurities from ore to get pure metal
  6. 8. any of the eight major bodies orbiting the sun
  7. 9. notice carefully and write down what you notice
  8. 12. material with a usable amount of metals/ minerals in it (enough to be worth mining)
  9. 15. reversible change
  10. 17. a concentrated area of specific minerals that have melted and separated into layers
  11. 20. quickly and easily comes back
  12. 22. how much matter there is in something
  13. 23. red planet